biprismn.
A glass prism with a refracting angle of nearly 180 degrees, used in observing the interference of light.
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the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [noun] > prism
prism1612
Nicol prism1838
Foucault prism1882
biprism1884
Fresnel biprism1890
Porro prism1909
pentaprism1937
1884 A. Daniell Text-bk. Princ. Physics 486 Such a beam may be divided in two parts..by refraction through a biprism.
1890 T. Preston Theory of Light 119 Fresnel's Bi-prism... Let CDE represent a glass prism with a very obtuse angle E... The whole prism is as if made up of two prisms CE and DE of very small angle (at C and D) placed base to base at E, and hence the name bi-prism.
1904 A. Schuster Introd. Theory Optics iv. 60 (heading) Fresnel's Biprism.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2019).
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